package com.kehanpay.sdk.example;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;

public class HttpPostUrl {
	
	/** 
     * 向指定URL发送POST请求 
     * @param url 
     * @param paramMap 
     * @return 响应结果 
     */  
    public static String sendPost(String url, Map<String, Object> paramMap) throws Exception {  
        PrintWriter out = null;  
        BufferedReader in = null;  
        String result = "";  
        URL realUrl = new URL(url);  
        // 打开和URL之间的连接  
        URLConnection conn = realUrl.openConnection();  
        // 设置通用的请求属性  
        conn.setRequestProperty("accept", "*/*");  
        conn.setRequestProperty("connection", "Keep-Alive");  
        conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");  
        conn.setRequestProperty("Charset", "UTF-8");  
        // 发送POST请求必须设置如下两行  
        conn.setDoOutput(true);  
        conn.setDoInput(true);  
        // 获取URLConnection对象对应的输出流  
     	out = new PrintWriter(conn.getOutputStream());  
  
            // 设置请求属性  
        String param = "";  
        if (paramMap != null && paramMap.size() > 0) {  
            Iterator<String> ite = paramMap.keySet().iterator();  
            while (ite.hasNext()) {  
                String key = ite.next();// key  
                String value = paramMap.get(key).toString();  
                param += key + "=" + value + "&";  
                }  
                param = param.substring(0, param.length() - 1);  
            }  
  
            // 发送请求参数  
        out.print(param);  
        // flush输出流的缓冲  
        out.flush();  
        // 定义BufferedReader输入流来读取URL的响应  
        in = new BufferedReader(  
                new InputStreamReader(conn.getInputStream(),"UTF-8"));  
        String line;  
        while ((line = in.readLine()) != null) {  
            result += line;  
        }  
        // 使用finally块来关闭输出流、输入流  
        if (out != null) {  
            out.close();  
        }  
        if (in != null) {  
            in.close();  
        }  
        return result;  
    }
}
